Question

(7а - 2а )*8 =80 и (15b + b)/ 4 = 3

Answer 1

(7а - 2а )*8 =80
7a-2a=80:8
5a=10
a=10:5
a=2

(15b + b)/ 4 = 3
15b+b=4*3
15+b=12
16b=12
b=12/16
b=3/4